US79185A - John guligk bakeb - Google Patents

Description

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JOHN -GULIeK BAKER, or PHILADELPHIA, PENNSYLVANIA, AssIeNeE To PIIMsELE .AND HENRY DIssTON, or SAME PLAGE.

Letters Patent No. 79,185, dated June 23, 1868.

IMPROVEMENT' IN SAWS.

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TO ALL WHOM. IT MAY OONCERN:

Beit known that I, JOHNGULICK BAKER, assigner to.1nyselt` and. Henry Disston, of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented an Improvement in Adjustable Cutters or Teeth for Saws; and I do hereby declareV the `following to be a full, clear, and exact description of the same. f

My invention consists of the construction ofa detachable block adapted to au opening'in the saw-blade, having` projections fit-ting corresponding notches inthe tooth, and secured by a packing of lead or other soft metal, interposed between the block and the saw-plate, as fully described hereafter; the straining and warping ot the saw, which result from the use of ordinary rivets, being thusY avoided. i

In order to enable others skilled in the art tomake and apply my invention, I willnow proceed to describe its construction and operation, reference being had to th'efaccompanying drawing, which forms a part ot' this specification, andin which Figure 1 represents part of the blade of a circular saw prior to being prepared for the reception of the adjustable'and detachable cutters. A i

Figure 2, the saine, showing a slotfor the reception of a cutter, and one cutter inserted.

` Figure 3, a section on the line 1-2,`g. v

Figure 4, a section'on the line 3 4.

Figure 5, a section on the line 5-6; and

Figure 6, an edge view of the cutter, onthe line 7-8,iig. 2. l

Figs. 3, 4, 5,and 6 are drawn on an enlarged scale.

Similar letters refer to similar parts throughoutthe several views..

A represents part ofthe blade of a circular saw, onrthe edge of whichy are formed teeth or projections of the form, or approximating to the form, seen in'figrl, each 4tooth having the rounded back, a, and hollow front, 6, v i l The teeth having been thus formed,`the next process, inthe presentinstance, is the preparation of the blade for thelreception of the detachable and adjustable cutters .,B, which is done by cutting 'slots a, with par'- allel edges, in the blade, neach slot commencing at orjearthe junction lof the back, a, with the front, b, of a tooth, and taking the inclined course represented.V j i l Y .i

On the rear edge of each slot is formed thev-shaped riby, best observed in the sectional views, gs. 3, 4,- und 5, the front edge, t, being plain, but having a recess, m, the edges of which (and the bottom, if deemed necessary,) are V-shaped A i I 1 B is the detachable cutter, the rear edge. of 'which is grooved, to suit the lshaped rear edge, y, ofthe slot; and in the front edge of the cutter, towards the lower end of,4 the same, is formed `a rack, n, linto any of the spaces between A the teeth of which can t projections, on a-,blocln e, adapted to .the recess m, which is deeper than the'block is thick.

The cutter having been pushed intoits place while the block c was. resting against the bottom of the recess m, the said block is pushed towards the front edge of the cutter, so that some ofthe spaces between the teeth of the latter shall be penetra-ted by the projections ou'the block;V `and .the space between the latter and th bottom of the recess is now illedwith a packing, of lead or other soft metal, the sole duty of which isto maintain the block in contactwith'the cutter. i Y A When, after'repeated sharpeniugs ofthe cutter byling or grindingithe -upper inclined end, g,=of the same, it becomes/necessary to readjust it Iby moving it outwards, the sot`t-metal packing is first punched out or other-- wise removed, the block is then depressed into the recess m, so that its projections'shall b e clear of those on the front edge of ythe cutter, which is then pushed outwards to .the desired extent, after which the block is readjusted to the rack ou the tooth, and soft-metal packing introduced into' the recess m, between the bottom of the same and the block.

- AIt will he seen that the block e, which holds the tooth in its positionl fits nicelr in the/opening formed partly in the Ytooth and partly in the blade, and is maintained in its place by the soft-metal packing, but that neither the'block nor the packing bears 'with such force against the sides of the opening as to warp the saw- 'blade. Withoutvcolnfinng myself toany particulaform of tooth,

y I claim as my invention, and desire to secure Letters'Patent--A y A hard-'metal block, adapted to an opening formed in the blade fof* saw, and having projections which fit notches in the dtachable tooth, .in combination with u Asoftemetal packingf`1tting 'the said opening at one side of the block, and maintaining the latter in its place, all 4being c o'nstru'ctedeand operating in' the manner suhlstantially as described.

Iii-testimony whereof, I have signedmy naine to this' lspecication in the presence of two subscribing witnesses.

" JOHN GULICK BAKER.

Witnesses:

JOHN Wnma, W. J. R. .DELANY.

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